I recently added a double-acting hydraulic cylinder (6" stroke) to my RB2060L rear blade so that I can angle it in either direction using my 3rd SCV. Works like a charm and actually angles a little more than the pin holes would have allowed. My favorite machine shop did the welding for me ($150).
I use the rear blade, in combination with the loader, for plowing snow (pulling forward) and the hydro-turn should make that job a little quicker.
The bad news is - I first bought a 10" stroke cylinder thinking "the longer the better" but that longer cylinder didn't fit into the rear blade's frame geometry so I then bought the 6" stroke cylinder. Now I have a brand new 10" cylinder that's crying for a purpose in life. So now I'm thinking "Hmmm ... maybe I need to modify the cart so it can hydraulically dump."
My wife is wondering when it will all end.